28021118 has 16 divisors (see below), whose sum is σ = 43110144. Its totient is φ = 13653720.

The previous prime is 28021109. The next prime is 28021121. The reversal of 28021118 is 81112082.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28021093 and 28021102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28373 + ... + 29343.

It is an arithmetic number, because the mean of its divisors is an integer number (2694384).

Almost surely, 2^28021118 is an apocalyptic number.

28021118 is a deficient number, since it is larger than the sum of its proper divisors (15089026).

28021118 is a wasteful number, since it uses less digits than its factorization.

28021118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 28021118 is about 5293.4977094545. The cubic root of 28021118 is about 303.7352192958.

The spelling of 28021118 in words is "twenty-eight million, twenty-one thousand, one hundred eighteen".